Add a utility to help test makedef.pl

Add a utility to help test makedef.pl

The output of makedef.pl varies too much based on local configuration to allow
us to generate any useful pre-canned expectations of correctness. Hence the only
real option left is to generate "Golden" results for the local platform prior to
any modification, and then compare post modification output with them, to see
that nothing (unexpected) changed. exercise_makedef.pl captures all output for
(currently) 576 permutations of command line parameters, to enable this testing.